Sunnyvale, Calif.Maxim Integrated Products has introduced the DS1841 temperature-compensated resistor optimized for avalanche photodiode (APD) voltage control.
The I²C-controlled, 128-position digital resistor uses a logarithmic scale specifically designed to linearize the control of APD voltages in fiber optic modules.
Every 2°C, an internal temperature sensor and A/D converter update the digital resistor's wiper position based on the temperature and the value corresponding to that temperature in its on-chip, 72-byte EEPROM lookup table. Both the temperature and supply voltage can be read on the I²C bus for other control/monitoring purposes. The predictable operation of the DS1841 makes it suitable for use in fiber optic modules that require a temperature-controlled voltage output.
The DS1841 is fully specified over the -40°C to +100°C operating temperature range, and is packaged in a tiny, 3mm x 3mm, 10-pin TDFN.
Pricing: Begins at $0.68 (10,000-up, FOB USA).
Maxim Integrated Products, 1-800-998-8800, www.maxim-ic.com